U.S. patent application number 11/936157 was filed with the patent office on 2008-05-22 for disc brake pad made of multi-compounds and manufacturing process thereof.
Invention is credited to I-Ching Chen.
Application Number | 20080116023 11/936157 |
Document ID | / |
Family ID | 38644077 |
Filed Date | 2008-05-22 |
United States Patent
Application |
20080116023 |
Kind Code |
A1 |
Chen; I-Ching |
May 22, 2008 |
Disc Brake Pad Made of Multi-Compounds and Manufacturing Process
Thereof
Abstract
A disc brake pad made of multi-compounds and a manufacturing
process thereof comprises a brake member compositely made of at
least one frictional compound. In other words, the surface of the
brake member is formed of more than two kinds of abrasion areas,
for example, the surface of the brake member is made of for the
frictional compound use in a wet condition and another frictional
compound for use in a dry condition, such that the frictional
compounds may be applied to the brake member solely or together so
as to accommodate in different conditions.
Inventors: |
Chen; I-Ching; (Changhua,
TW) |
Correspondence
Address: |
KAMRATH & ASSOCIATES P.A.
4825 OLSON MEMORIAL HIGHWAY, SUITE 245
GOLDEN VALLEY
MN
55422
US
|
Family ID: |
38644077 |
Appl. No.: |
11/936157 |
Filed: |
November 7, 2007 |
Current U.S.
Class: |
188/251A ;
188/26; 29/700 |
Current CPC
Class: |
F16D 2069/002 20130101;
B62L 1/005 20130101; Y10T 29/53 20150115; F16D 69/02 20130101; F16D
2069/004 20130101 |
Class at
Publication: |
188/251.A ;
188/26; 29/700 |
International
Class: |
F16D 69/02 20060101
F16D069/02; B23P 19/04 20060101 B23P019/04; B62L 1/00 20060101
B62L001/00 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 17, 2006 |
TW |
095220218 |
Claims
1. A manufacturing process of a disc brake pad made of
multi-compounds comprising the steps of: I. Stamping: forming a
body, wherein a metal plate is first formed in a stamping process;
II. Surface Preparation: the body can be sand blasted to achieve
surface roughness suitable for bonding of cooper coating; III.
Greens: any number of friction compounds are pressed to form a
semi-solid composite material by using a pressing method, wherein
the sinter greens, wherein the surface of the metal plate is plated
to form a copper layer by using electroplating or the like, the
blended friction compounds are placed into a sintering processor;
the semi-metallic layer denotes that it is the friction compound
made of 30%-60% of metal content and is manufactured using either
hot or cold press production techniques; the organic greens,
wherein the body's surface in contact with one or all the
frictional compound blocks is coated with an adhesive, the organic
layer means that it is the friction compound made of less than 30%
of metal content and is manufactured using either hot or cold press
production techniques; IV. Grinding: wherein the surface of the
brake member is ground by a grinding machine so as to eliminate
impurities attached thereon and to achieve required section
thickness.
2. The manufacturing process of a disc brake pad made of
multi-compounds as claimed in claim 1, wherein said body is made of
aluminum, steel, or stainless steel and the like metal
materials.
3. The manufacturing process of a disc brake pad made of
multi-compounds as claimed in claim 1, wherein said plating method
may be replaced by a high temperature spraying method.
4. The manufacturing process of a disc brake pad made of
multi-compounds as claimed in claim 1, wherein in the sintering
process, the frictional materials are placed into a sintering
processor, the temperature of which is maintained within 800-1200
degrees and is lasted for 4-8 hours.
5. The manufacturing process of a disc brake pad made of
multi-compounds as claimed in claim 1, wherein the frictional
material is curing of both the semi-metallic or organic friction
compound and placed into a heat theater, the temperature of which
is maintained within 100-250 degrees and is lasted around 2-8
hours.
6. A disc brake pad being characterized in that it is manufactured
by using said manufacturing process as claimed in claim 1.
7. A manufacturing process of a disc brake pad made of
multi-compounds comprising a brake member formed of a body and an
abrasion area, said body being constructed in the formed of an
elongated plate, wherein said abrasion area is located at one side
of said body and comprised of blocks made of different compounds,
at least including a sinter block, semi-metallic, or an organic
block in which at lease two kinds of compound may be selected to
produce said abrasion area.
8. A disc brake pad for use in a bicycle comprising: a brake disc;
a brake caliper including a brake member attached therein for
clamping said brake disk and formed of a body and an abrasion area,
said body being constructed in the form of an elongated plate by
using a stamping method; an abrasion area located at one side of
said body and comprised of at least two blocks made of different
frictional compounds.
9. The disc brake pad for use in a bicycle as claimed in claim 8,
wherein said body includes a plurality of parallel elongated slots
arranged on one side thereof and evenly spaced apart from each
other for a tight engagement with said abrasion area; said abrasion
area includes a plurality of parallel ribs relative to said
elongated slots arranged on one side thereof and equally spaced
apart from each other such that said ribs may be matingly received
in said elongated slots.
10. The disc brake pad for use in a bicycle as claimed in claim 8,
wherein said body is made of aluminum, steel, or stainless steel
and the like metal materials.
11. The disc brake pad for use in a bicycle as claimed in claim 8,
wherein said body further includes a number of protrusions disposed
on another side thereof and extending outwardly therefrom.
12. The disc brake pad for use in a bicycle as claimed in claim 8,
wherein said body includes a heat resisting layer covered on at
least one side thereof for lowering heat conduction.
13. The disc brake pad for use in a bicycle as claimed in claim 11,
wherein said heat resisting layer may be made of ceramic materials
or heat insulating materials so as to lower heat conduction to said
body.
14. The disc brake pad for use in a bicycle as claimed in claim 8,
wherein said abrasion area is further spaced out a plurality of
blocks apart for being made of various types of abrasion
materials.
15. The disc brake pad for use in a bicycle as claimed in claim 13,
wherein the frictional materials of said abrasion area are
distinguished from each other by way of different colors.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a disc brake pad, and more
particularly to a disc brake pad made of multi-frictional compound
and a manufacturing process thereof that may be used in different
conditions.
[0003] 2. Description of the Prior Arts
[0004] A prior art brake member of a disc brake pad is made of sole
frictional compound, limiting its braking performance to certain
conditions/environments. For instance, if the prior art brake
member is made of sintered-metal compound, enhancing the brake
effect at elevated temperatures and in the wet, but at the expense
of increasing heat generation and excessive noise, wearing the
brake disc, giving poor low temperature brake performance and
transferring high levels of heat to the brake fluid limiting the
effectiveness of the brake for prolonged braking. Nevertheless, if
desiring to restrain the noises, wear, limit heat generation and
improve low temperature performance by selection of an "organic"
compound for example the high temperature performance of the brake
member is accordingly diminished along with the pad wear rate and
generally it's wet performance.
[0005] Conventionally, a large amount of organic compounds have
been used to produce brake members, however as consequence of the
high temperature resulting from friction when prolonged braking is
required fade of the brake member will happen due to heat
accumulation.
[0006] To overcome above-mentioned problem, an improved brake
member may be manufactured by way of compounds with a higher metal
material content. Unfortunately, as direct result of the frictional
improvement, the pad will operate at a higher temperature and will
more quickly conduct the heat to the piston, bringing about
excessive heating of the brake oil impairing its ability function
correctly and thereby limiting braking performance.
[0007] The present invention has arisen to mitigate and/or obviate
the afore-described disadvantages.
SUMMARY OF THE INVENTION
[0008] The primary object of the present invention is to provide a
disc brake pad made of multi-compounds that is capable of giving an
improved level of performance over a greater variety of
environments and braking demand requirements when compared to a
single compound pad, meaning it may be utilized in many different
conditions.
[0009] The secondary object of the present invention is to provide
a disc brake pad made of multi-compounds, the lest conductive one
of which is applied on the opposite side of the section of backing
plate that comes into direct contact with the piston over the
piston, thereby limiting heat transfer to the braking fluid.
[0010] A third object of the present invention is to provide a disc
brake pad made of multi-compounds that includes the heat resisting
layer formed therein for lowering the heat conduction between the
brake member and the piston.
[0011] A fourth object is to limit the contact area between the
piston and brake backing plate further by reducing the heat
transfer to the piston, furthermore protrusions on the backing
plate surface will promote air flow between the backing plate and
piston also allowing cooling of the piston/backing plate thus
further limiting heat transfer.
[0012] Another object of the present invention is to provide a
manufacturing process of a disc brake pad made of multi-compounds
that may enhance the wear/life of both the pad itself and the brake
disk.
[0013] In accordance with one aspect of the present invention,
there is provided a disc brake pad made of multi-compounds and a
manufacturing process thereof comprising a brake member compositely
made of at least one abrasion area. In other words, the surface of
the brake member is formed of more than two kinds of frictional
materials, for example, the surface of the brake member is made of
the frictional compound for use in a wet condition and another
frictional compound for use in a dry condition, such that the
abrasion area may be applied to the brake member solely or together
so as to accommodate in different conditions.
[0014] The present invention will become more obvious from the
following description when taken in connection with the
accompanying drawings, which show, for purpose of illustrations
only, the preferred embodiment in accordance with the present
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 is a perspective diagram illustrating the exploded
components of a disc brake pad made of multi-compounds according to
the present invention;
[0016] FIG. 2 is a perspective diagram illustrating the exploded
components of the brake member of the disc brake pad made of
multi-compounds according to a first embodiment of the present
invention;
[0017] FIG. 3 is a perspective diagram illustrating the assembly of
the brake member of the disc brake pad made of multi-compounds
according to a first embodiment of the present invention;
[0018] FIG. 4 is a cross sectional diagram illustrating the
operating state of the disc brake pad made of multi-compounds
according to the present invention;
[0019] FIG. 5 is another cross sectional diagram illustrating the
operating state of the disc brake pad made of multi-compounds
according to the present invention;
[0020] FIG. 6 is also another cross sectional diagram illustrating
the operating state of the disc brake pad made of multi-compounds
according to the present invention;
[0021] FIG. 7 is a perspective diagram illustrating the abrasion
area of the brake member being comprised of at lease one block
according to a third embodiment of the present invention;
[0022] FIG. 8 is a cross sectional diagram illustrating the
operating state of a disc brake pad made of multi-compounds
according to a second embodiment of the present invention;
[0023] FIG. 9 is a perspective diagram illustrating the assembly of
the brake member of the disc brake pad made of multi-compounds
according to the second embodiment of the present invention
[0024] FIG. 10 is another cross sectional diagram illustrating the
operating state of the disc brake pad made of multi-compounds
according to the second embodiment of the present invention;
[0025] FIG. 11 is a perspective diagram illustrating the abrasion
area of the brake member being comprised of at lease one block
according to a fourth embodiment of the present invention;
[0026] FIG. 12 is a perspective diagram illustrating the abrasion
area of the brake member being comprised of at lease one block
according to a fifth embodiment of the present invention;
[0027] FIG. 13 is a flow chart illustrating a manufacturing process
of a disc brake pad made of multi-compounds according to the
present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0028] Referring to FIG. 1, a disc brake pad made of
multi-compounds in accordance with a first embodiment of the
present invention comprises a brake disc 10, a brake caliper 20
including a brake member 30 attached therein for clamping the brake
disc 10, such that a wheel of a running bicycle may be braked.
[0029] As shown in FIG. 2, the brake member 30 is formed of a body
31 and an abrasion area 32, the body 31 includes a plurality of
parallel elongated slots 311 arranged on one side thereof and
evenly spaced apart from each other for a tight engagement with the
abrasion area 32. The abrasion area 32 includes a plurality of
parallel ribs 321 relative to the elongated slots 3 11 arranged on
one side thereof and equally spaced apart from each other such that
the ribs 321 may be matingly received in the elongated slots
311.
[0030] As illustrated in FIGS. 3 and 9, the body 31 may be a metal
material made of aluminum, steel or stainless steel and the like,
and if one of the frictional compounds consists of sintered metal
is copper plated to facilitate bonding to the body 31 further
includes a number of protrusions 312 disposed on another side
thereof and extending outwardly therefrom.
[0031] With reference to FIGS. 4-6, the body 31 includes a heat
resisting layer 310 covered on at least one side thereof for
lowering heat conduction, the heat resisting layer 310 may be made
of ceramic materials or heat insulating materials so as to lower a
heat conduction to the body 31.
[0032] As shown in FIGS. 7, 11 and 12, the abrasion area 32 is
located at one side of the body 30 and comprised of at lease one
block 320 made of friction compounds, and is further spaced out a
plurality of blocks 320 apart for being made of various types of
friction compounds which could be further distinguished from each
other by way of different colors. Furthermore, the blocks 320 may
be formed of wear proof, anti slip, heat resisting, and quick-brake
available and the like materials, thereby accommodating in
different conditions, such as in a rainy day or on a muddy
road.
[0033] In operation, as shown in FIGS. 8 and 10, a disk brake pad
made of multi-compounds in accordance with a second embodiment of
the present invention may be provided to effectively reduce the
heat conduction, thus enhancing the brake performance.
[0034] As illustrated in FIGS. 1-6, as desiring to stop the
operating brake disc 10 of the bicycle, the user merely has to
press a handle of the bicycle, and by using hydraulic pressure or
cables and a mechanism pistons 21 of the brake calipers 20, the
bodies 31 are pushed to displace toward the two sides of the
operating brake disk 10 respectively, simultaneously stopping the
operating brake disk 10.
[0035] With reference to FIG. 4, since one side of the body 31 is
covered by the heat resisting layer 310 made of ceramic materials
or heat insulating materials, the heat will be effectively stopped
conducting to the body 31, such that the abrasion area 32 may not
cause a high temperature resulting from friction to prevent the
denaturalization of the brake oil, thereby maintaining the brake
performance. On the other hand, on one side of the body 31 are
arranged the protrusions 312, accordingly the area of the body 31
contacting with the piston 21 of the brake caliper 20 becomes
smaller, thus decreasing heat conduction, these protrusions 312
would also facilitate air flow between said brake disc 10 and
piston 21. Additionally the frictional compound that lest readily
conducts heat could be positioned on the opposite side of the
backing plate area that directly comes into contact with the piston
21 furthermore reducing heat transfer to the brake fluid.
[0036] Referring to FIGS. 4 and 5, on another side of the abrasion
area 32 opposite to the ribs 321 are formed a number of intersected
passages 323 for obtaining heat releasing, water discharging and
pollution preventing purpose.
[0037] As illustrated in FIG. 13, a manufacturing process of a disc
brake pad made of multi-compounds according to the present
invention includes the steps of:
[0038] I. Stamping 401: Forming a body, wherein a metal plate is
first formed in a stamping process, and the body 31 is made of
either aluminum, steel, or stainless steel and the like metal
materials.
[0039] II. Surface Preparation 402: the body 31 is can be sand
blasted to achieve surface roughness suitable for bonding of cooper
coating and/or provide a surface for subsequent adhesive for
bonding of the frictional material, wherein [0040] plating: the
surface of the metal plate is plated to form a copper layer by
using electro-plating or the like, the plating method may be
replaced by a high temperature spraying method; if no sintered
friction compound is required in final product this process could
be omitted, wherein [0041] adhesive application: the body 31
surface in contact with one or all the frictional compound blocks
32 is coated with an adhesive to improve the bond strength between
the two. If sintered material is required in the final product this
process may be omitted;
[0042] III. Greens 403: wherein any number of friction compound s
are pressed to form a semi-solid composite material by using a
pressing method, for certain compounds these pre-forms may also
need to be manufactured at elevated temperature, and the semi-solid
composite material is placed onto one side of the body 31, and then
by means of a pressing machine, the body 31 is pressed with the
semi-solid composite material so as to combine them tightly,
forming a brake member 30, this process usually takes place at
elevated temperature to improve bonding between all the different
materials constituting the compound and to cure the adhesive to
improve the bond between the friction compound and the body 31,
wherein [0043] hot/cold pressing: forming an abrasion area 32,
wherein the individual compounds are press formed to become blocks
such that the abrasion area 32 is made of different compounds each
of which come into contact with the disk solely or simultaneously;
the abrasion area 32 will be made up of at least two compounds
consisting of either sintered metal block, semi-metallic block, or
organic block. Note other frictional compounds could be considered
such as ceramic or carbon, in which at lease two kinds of compounds
may be selected to produce the abrasion area 32, wherein
[0044] the sintered compound block implies that it is the friction
compound made of more than 60% of metal and is manufactured using a
sintering process, the blended friction compounds are placed into a
sintering processor, whereby a compressive load is applied to the
compound whilst the temperature of which is maintained within
800-1200 degrees for 4-8 hours;
[0045] the semi-metallic block denotes that it is the friction
compound made of 30%-60% of metal content and is manufactured using
either hot or cold press production techniques;
[0046] the organic block means that it is the friction compound
made of less than 30% of metal content and is manufactured using
either hot or cold press production techniques; if necessary
further curing of both the semi-metallic or organic friction
compound can be carried out by placing product into a heat treater,
the temperature of which is maintained within 100-250 degrees and
may last around 2-8 hours, wherein [0047] heat treating: the brake
member 30 is placed into the hot treater for heating, thereby
enhancing its hardness and toughness. If necessary the brake pad
may be further coated using a spray painting method for example to
improve corrosion resistance and/or to improve aesthetics.
[0048] IV. Grinding 404, wherein the surface of the brake member 30
is ground by a grinding machine so as to eliminate impurities
attached thereon and to achieve required section thickness.
[0049] It can be clearly seen from the preceding accounts on the
features of the present invention that the disc brake pad made of
multi-materials of the present invention has the following
advantages: [0050] 1. Enhancing the brake performance: the present
invention is manufactured by using a composite forming method,
thereby enabling to combine various kinds of frictional compounds
together, thereby improving braking performance over a wider range
different conditions. [0051] 2. Improving heat conduction: the
present invention is manufactured by adding the heat resisting
compound directly over piston contact area therein and by using a
heat resisting method, prohibiting the heat generated due to
friction at the brake/disk interface from transferring to the brake
fluid, and increasing the stability of brake. [0052] 3. Improving
heat conduction: the present invention is manufactured by adding
the heat resisting layer to the backing plate therein and by using
a heat resisting method, prohibiting the heat generated due to
friction at the brake/disk interface from transferring to the brake
fluid, and increasing the stability of brake. [0053] 4. Improving
heat conduction: the present invention is manufactured by adding on
one side of the body 31 protrusions 312, accordingly the area of
the body 31 contacting with the piston 21 of the brake caliper 20
becomes smaller, thus decreasing heat conduction.
[0054] The invention is not limited to the above embodiment but
various modifications thereof may be made. It will be understood by
those skilled in the art that various changes in form and detail
may be made without departing from the scope and spirit of the
present invention.
* * * * *